A multi-resonant broadband direct-drive vibration absorber

Abstract

The utility model discloses a kind of multi-resonance broadband direct-drive vibration damper, including shell, fundamental frequency vibration damper component and harmonic vibration damper component, fundamental frequency vibration damper component includes two identical fundamental frequency vibration damper units, harmonic vibration damper component includes two identical harmonic vibration damper units, fundamental frequency vibration damper unit and harmonic vibration damper unit respectively include eccentric mass, inner casing, outer casing and frameless motor, inner casing and outer casing are respectively sleeved on the protruding shaft of eccentric mass both sides, bearing is equipped between inner casing, outer casing and eccentric mass shaft, frameless motor is fixedly installed in outer casing, frameless motor rotor is fixedly connected with eccentric mass shaft, the two fundamental frequency vibration damper units of the composition fundamental frequency vibration damper component are coaxial and the inner casing side is arranged oppositely, the two harmonic vibration damper units of the composition harmonic vibration damper component are coaxial and the inner casing side is arranged oppositely, fundamental frequency vibration damper component and harmonic vibration damper component are installed in shell and coaxial arrangement.

Description

Technical Field

[0001] This utility model belongs to the field of vibration damping actuator technology, specifically relating to a multi-harmonic wideband direct-drive vibration damping actuator. Background Technology

[0002] In a vibrating environment, vibration damping actuators are typically installed to reduce the vibration of vibrating components and change their vibration state.

[0003] Existing research on active vibration damping actuators, such as the vibration damping actuator disclosed in patent application number CN201920878072.4, includes a motor, a transmission assembly, and two mass blocks. The motor output is connected to the transmission assembly, which in turn is connected to the two mass blocks, allowing the motor to simultaneously drive both mass blocks to rotate. The two mass blocks have the same mass and are arranged side by side. Furthermore, the two mass blocks can rotate with the same radius of rotation, the same speed, and in opposite directions. This vibration damper achieves active vibration reduction, but the gear-based transmission assembly inevitably introduces noise. Additionally, it requires larger parameters to achieve the desired size, weight, and power consumption, thus limiting its practical application.

[0004] For example, patent application CN202120268822.3 discloses a vibration damping actuator. This damper uses a frameless motor rotor to drive a mass block to rotate. Both the frameless motor rotor and the mass block are supported by internal bearings. A set of identical mass blocks outputs a wide-bandwidth output force with an adjustable centrifugal force angle, which cancels out the vibration force in the operating environment, achieving active vibration damping. This damper uses a motor to drive the mass block to output damping force, achieving active vibration damping and solving the problems of slow response and narrow bandwidth of passive vibration damping. The internal bearing direct drive method solves the problems of high noise, large size, heavy weight, and high power consumption of gear-based transmission components. However, this damper outputs a wide-bandwidth output force with an adjustable centrifugal force angle using a set of identical mass blocks, resulting in a narrow damping force amplitude bandwidth. It also requires two sets of dampers to work together, limiting its application to situations with high damping force amplitude bandwidth. Its low integration limits its practical application.

[0005] For example, patent application CN202421179110.4 discloses a vibration damping actuator. This damper uses a frameless motor rotor to drive a mass block to rotate. Both the frameless motor rotor and the mass block are supported by distributed bearings. The two sets of identical mass blocks output a wide-bandwidth output force with an adjustable centrifugal force angle, which cancels out the vibration force in the operating environment, achieving active vibration damping. This damper uses a motor-driven mass block to output damping force, achieving active vibration damping and solving the problems of slow response and narrow bandwidth in passive vibration damping. The distributed bearing direct drive method solves the problems of high noise, large size, heavy weight, and high power consumption of gear-based transmission components. The integration of two sets of identical mass blocks solves the problems of narrow output damping force amplitude and low integration. However, this damper responds to output under a single-frequency input command, and cannot respond to output under multi-frequency input commands such as resonance to improve vibration damping efficiency, which limits its practical application.

[0006] Therefore, a vibration damping actuator is urgently needed to solve the above problems. Utility Model Content

[0007] This utility model addresses the shortcomings of existing technologies by providing a multi-harmonic wideband direct-drive vibration damping actuator. By adopting a combination design of frameless motor and distributed bearings, and optimizing the structure of the mass block, it makes full use of internal space, greatly reduces the structural volume, has high integration, and facilitates improved vibration damping efficiency in a smaller space.

[0008] This utility model achieves this objective through the following technical solution:

[0009] A multi-harmonic wideband direct-drive vibration damping actuator includes a housing, a fundamental frequency damping component, and a harmonic damping component. The fundamental frequency damping component includes two identical fundamental frequency damping units, and the harmonic damping component includes two identical harmonic damping units. Each fundamental frequency damping unit and harmonic damping unit includes an eccentric mass block, an inner casing, an outer casing, and a frameless motor. The inner casing and the outer casing are respectively mounted on rotating shafts protruding from both sides of the eccentric mass block. Bearings are provided between the inner casing, the outer casing, and the rotating shafts of the eccentric mass block. The frameless motor is centrally mounted inside the outer casing, and the rotor of the frameless motor is centrally connected to the rotating shaft of the eccentric mass block. The two fundamental frequency damping units constituting the fundamental frequency damping component are coaxial and arranged opposite each other on the inner casing side. The two harmonic damping units constituting the harmonic damping component are coaxial and arranged opposite each other on the inner casing side. The fundamental frequency damping component and the harmonic damping component are installed inside the housing and are coaxially arranged.

[0010] Furthermore, the eccentric mass block of the fundamental frequency damping unit is the same as the eccentric mass block of the harmonic damping unit.

[0011] Furthermore, the eccentric mass blocks of both the fundamental frequency damping unit and the harmonic damping unit are composed of a chassis with a rotating shaft and an eccentric block mounted on the chassis. The eccentric mass of the eccentric mass block of the fundamental frequency damping unit is greater than the eccentric mass of the eccentric mass block of the harmonic damping unit.

[0012] Furthermore, magnetic encoders are respectively installed on the frameless motor stators of the fundamental frequency damping unit and the harmonic damping unit.

[0013] Furthermore, the housing is provided with end caps.

[0014] Furthermore, the end cap contains a drive circuit board for controlling the frameless motor.

[0015] Furthermore, the inner casing, the outer casing, and the housing are fixedly connected.

[0016] Furthermore, the housing is cylindrical and has a fixed connection part with threaded holes inside. The fixed connection part has teeth that are circumferentially spaced and evenly distributed on the inner wall of the housing. The inner casing and the outer casing have mounting holes at corresponding positions of the threaded holes. Bolts pass through the mounting holes and connect to the threaded holes of the fixed connection part.

[0017] Furthermore, the outer casing is composed of an outer ring and a cylindrical frustum with the inner diameter of the ring as the bottom surface. The top surface of the cylindrical frustum is connected to the rotating shaft of the eccentric mass block through a bearing. The frameless motor stator is mounted on the bottom surface of the cylindrical frustum, and the mounting hole is located on the ring.

[0018] Furthermore, the outermost side of the inner casing is provided with toothed protrusions spaced apart on the circumference, the protrusions corresponding to the fixed connection portion, and the mounting hole is provided on the protrusion at a position corresponding to the threaded hole of the fixed connection portion.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] The multi-harmonic wideband direct-drive vibration damping actuator provided by this utility model uses a motor-driven mass block to output vibration damping force, realizing active vibration damping and solving problems such as slow response and narrow bandwidth of passive vibration damping; the distributed bearing direct drive method used solves the problems of high noise, large size, heavy weight and high power consumption of gear-based transmission components; the integrated use of two different mass blocks solves the problem of improving the vibration damping efficiency of output vibration damping force.

[0021] The multi-harmonic broadband direct-drive vibration damping actuator provided by this utility model drives the mass block to rotate through the rotor of a frameless motor. Both the rotor of the frameless motor and the mass block are supported by distributed bearings. One set of identical mass blocks outputs a fundamental frequency broadband output force with an adjustable centrifugal force angle, which cancels out the vibration force in the operating environment, thereby achieving fundamental frequency active vibration damping. The other set of identical mass blocks outputs a harmonic broadband output force with an adjustable centrifugal force angle, thereby achieving harmonic active vibration damping and improving vibration damping efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the vibration damping actuator in an embodiment of the present invention.

[0023] The reference numerals in the figure are: 1-end cover, 2-magnetic encoder, 3-frameless motor, 4-outer casing, 5-bearing, 6-fundamental frequency eccentric mass block, 7-inner casing, 8-housing, 9-harmonic eccentric mass block, 10-fixed connection part. Detailed Implementation

[0024] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art. It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] Reference Figure 1 This utility model provides an embodiment of a multi-harmonic wideband direct-drive vibration damping actuator, including a housing 8, a fundamental frequency vibration damping component, and a harmonic vibration damping component. The fundamental frequency vibration damping component includes two identical fundamental frequency vibration damping units, and the harmonic vibration damping component includes two identical harmonic vibration damping units.

[0026] The fundamental frequency damping unit includes a fundamental frequency eccentric mass block 6, an inner casing 7, an outer casing 4, and a frameless motor 3. The inner casing 7 and the outer casing 4 are respectively mounted on the protruding rotating shafts on both sides of the fundamental frequency eccentric mass block 6. Bearings 5 ​​are provided between the inner casing 7, the outer casing 4, and the rotating shaft of the fundamental frequency eccentric mass block 6. The frameless motor 3 is centrally installed inside the outer casing 4. The rotor of the frameless motor 3 is centrally connected to the rotating shaft of the fundamental frequency eccentric mass block 6. The two fundamental frequency damping units that make up the fundamental frequency damping assembly are coaxial and arranged opposite each other on the inner casing 7 side.

[0027] The harmonic vibration damping unit includes a harmonic eccentric mass block 9, an inner casing 7, an outer casing 4, and a frameless motor 3. The inner casing 7 and the outer casing 4 are respectively mounted on the protruding shafts on both sides of the harmonic eccentric mass block 9. Bearings 5 ​​are provided between the inner casing 7, the outer casing 4, and the shafts of the harmonic eccentric mass block 9. The frameless motor 3 is centrally installed inside the outer casing 4. The rotor of the frameless motor 3 is centrally connected to the shaft of the harmonic eccentric mass block 9. The two harmonic vibration damping units that make up the harmonic vibration damping assembly are coaxial and arranged opposite each other on the inner casing 7 side.

[0028] The fundamental frequency damping component and the harmonic damping component are installed inside the housing 8 and arranged coaxially.

[0029] Both the fundamental frequency eccentric mass block 6 and the harmonic eccentric mass block 9 consist of a chassis with a rotating shaft and eccentric blocks mounted on the chassis. The mass of the eccentric block of the fundamental frequency eccentric mass block 6 is greater than the mass of the eccentric block of the harmonic eccentric mass block 9.

[0030] The housing 8 is cylindrical and has a fixed connection part 10 with threaded holes inside. The fixed connection parts 10 are evenly distributed around the inner wall of the housing 8 and are arranged in a staggered tooth shape. The inner casing 7 and the outer casing 4 have mounting holes at corresponding positions of the threaded holes. Bolts pass through the mounting holes and connect to the threaded holes of the fixed connection parts 10. End caps 1 are installed at both ends of the housing 8.

[0031] The outer casing 4 consists of an outer ring and a cylindrical frustum with the inner diameter of the ring as the bottom surface. The ring and the cylindrical frustum are an integral structure. The top surface of the cylindrical frustum is sleeved on the shaft of the fundamental frequency eccentric mass block 6 or the harmonic eccentric mass block 9 through a bearing 5. The stator of the frameless motor 3 is installed on the bottom surface of the cylindrical frustum, and the mounting hole is located on the ring.

[0032] The outermost part of the inner casing 7 is provided with toothed protrusions distributed on the circumference. The protrusions correspond to the fixed connection part 10, and the mounting holes are provided on the protrusions at positions corresponding to the threaded holes of the fixed connection part 10.

[0033] A magnetic encoder 2 is installed on the stator of the frameless motor 3.

[0034] Taking the fundamental frequency vibration damping component as an example, the frameless motor 3 is centrally installed in the outer casing 4. The rotor of the frameless motor 3 is centrally connected to the shaft of the fundamental frequency eccentric mass block. The fundamental frequency eccentric mass block 6 provides radial support and axial limit through the combination of bearing 5, outer casing 4 and inner casing 7, thereby realizing that the frameless motor 3 drives the fundamental frequency eccentric mass block 6 to rotate. At the same time, the end cover 1 is equipped with a drive circuit board that controls the drive of the frameless motor 3.

[0035] The control circuit on the drive circuit board drives the frameless motor 3 to respond to different rotation frequencies, amplitudes and phase angles according to the instructions; the frameless motor 3 drives the eccentric mass block to rotate at the same speed in real time. The fundamental frequency eccentric mass block 6 and the harmonic eccentric mass block 9 can both achieve a response frequency stability accuracy of 0.1%, a 180-degree phase response time of 0.3s, and a phase error accuracy of 1.8 degrees.

[0036] In this embodiment, the eccentric mass component has an eccentric structure. When rotating around its axis, it outputs a centrifugal force curve that is a sinusoidal output force in the plane around the axis. At the same time, the thickness of the eccentric mass component is comparable to that of the frameless motor 3, achieving the goal of not increasing the thickness but only increasing the radial dimension. The increase in dimension is designed according to the maximum output force index, and the output force of a single eccentric mass component can reach 1000N.

[0037] The control circuit on the drive circuit board collects the rotation angle and position of the frameless motor 3 in real time through the Hall angle sensor and the high-precision magnetic encoder 2 in the stator of the frameless motor 3. Through the control algorithm, it realizes real-time control of the motor rotation frequency and phase angle to meet the requirements of the control command.

[0038] The multi-harmonic wideband direct-drive vibration damping actuator in this embodiment features a symmetrical rotating structure. One side consists of two sets of "frameless motors + fundamental frequency eccentric mass blocks," while the other side comprises two sets of "frameless motors + harmonic eccentric mass blocks," with the rotation of the "frameless motors + eccentric mass blocks" coaxial. The control circuit controls the rotation of two sets of eccentric mass blocks separately, responding to the same rotation frequency, amplitude, but different phase angles. This allows the output of a variable sinusoidal force in the plane around the axis at the same rotation frequency for both sets of eccentric mass components.

[0039] In a vibration environment, a "multi-harmonic wideband direct-drive vibration damping actuator" controls two sets of fundamental frequency eccentric mass components to respond in real time to the same frequency, achieving a combined output force from the two sets, and thus realizing a sinusoidal output force at a certain angle in the plane of the axis. The rotation frequency, phase angle, and the angle in the plane of the axis in the corresponding command are exactly the same as the vibration frequency and vibration force angle of the vibration environment, but the phase angle differs by 180 degrees, realizing active cancellation of the environmental vibration force, and thus achieving active vibration damping. The other two sets of harmonic eccentric mass components respond in real time to another frequency (such as the harmonic frequency in the environmental vibration). The rotation frequency, phase angle, and the angle in the plane of the axis in the command are exactly the same as the harmonic vibration frequency and vibration force angle of the vibration environment, but the phase angle differs by 180 degrees, realizing active cancellation of the environmental harmonic vibration force.

[0040] The fundamental frequency eccentric mass block 6 and the harmonic eccentric mass block 9 can be eccentric blocks of the same mass. By setting the output parameters of the electrodes connected to them, the active cancellation of environmental vibration force and harmonic vibration force can also be achieved, achieving the same technical effect as the above embodiment.

[0041] The present invention has been described in detail above through embodiments, but the content described is only an exemplary embodiment of the present invention and should not be considered as limiting the scope of implementation of the present invention. The protection scope of the present invention is defined by the claims. Any technical solutions designed by those skilled in the art using the technical solutions described in the present invention, or designed by those skilled in the art under the inspiration of the technical solutions of the present invention, within the substance and protection scope of the present invention, to achieve the above-mentioned technical effects, or equivalent changes and improvements made to the scope of the application, should still fall within the patent protection scope of the present invention. It should be noted that, for clarity, descriptions of some components and processes that are not directly and obviously related to the protection scope of the present invention but are known to those skilled in the art have been omitted in the description of the present invention.

Claims

1. A multi-resonant broadband direct drive vibration absorber, characterized by, The system includes a housing, a fundamental frequency damping assembly, and a harmonic damping assembly. The fundamental frequency damping assembly comprises two identical fundamental frequency damping units, and the harmonic damping assembly comprises two identical harmonic damping units. Each fundamental frequency damping unit and harmonic damping unit includes an eccentric mass block, an inner casing, an outer casing, and a frameless motor. The inner casing and the outer casing are respectively mounted on rotating shafts protruding from both sides of the eccentric mass block. Bearings are provided between the inner casing, the outer casing, and the rotating shafts of the eccentric mass block. The frameless motor is centrally mounted inside the outer casing, and the rotor of the frameless motor is centrally connected to the rotating shafts of the eccentric mass block. The two fundamental frequency damping units constituting the fundamental frequency damping assembly are coaxial and arranged opposite each other on the inner casing side. The two harmonic damping units constituting the harmonic damping assembly are coaxial and arranged opposite each other on the inner casing side. The fundamental frequency damping assembly and the harmonic damping assembly are installed inside the housing and are coaxially arranged.

2. A multi-resonant wideband direct drive vibration actuator according to claim 1, wherein The eccentric mass block of the fundamental frequency damping unit is the same as the eccentric mass block of the harmonic damping unit.

3. The multi-resonant wideband direct drive vibration actuator of claim 1, wherein The eccentric mass blocks of both the fundamental frequency damping unit and the harmonic damping unit are composed of a chassis with a rotating shaft and an eccentric block mounted on the chassis. The eccentric mass of the eccentric mass block of the fundamental frequency damping unit is greater than the eccentric mass of the eccentric mass block of the harmonic damping unit.

4. The multi-resonant wideband direct drive vibration actuator of claim 1, wherein, Magnetic encoders are respectively installed on the frameless motor stators of the fundamental frequency damping unit and the harmonic damping unit.

5. The multi-resonant wideband direct drive vibration actuator of claim 1, wherein, The housing is provided with end caps.

6. A multi-resonant wideband direct drive vibration actuator according to claim 5, wherein The end cap contains a drive circuit board for controlling the frameless motor.

7. The multi-resonant wideband direct drive vibration actuator of claim 1, wherein The inner casing, the outer casing, and the housing are fixedly connected.

8. A multi-resonant wideband direct drive vibration actuator according to claim 7, wherein The housing is cylindrical and has a fixed connection part with threaded holes inside. The fixed connection part has teeth that are circumferentially spaced and evenly distributed on the inner wall of the housing. The inner casing and the outer casing have mounting holes at corresponding positions of the threaded holes. Bolts pass through the mounting holes and connect to the threaded holes of the fixed connection part.

9. A multi-resonant wideband direct drive vibration actuator according to claim 8, wherein The outer casing consists of an outer ring and a cylindrical frustum with the inner diameter of the ring as the base. The top surface of the cylindrical frustum is connected to the rotating shaft of the eccentric mass block via a bearing. The frameless motor stator is mounted on the bottom surface of the cylindrical frustum, and the mounting hole is located on the ring.

10. The multi-resonant wideband direct drive vibration actuator of claim 8, wherein, The outermost side of the inner casing is provided with toothed protrusions spaced apart on the circumference. The protrusions correspond to the fixed connection parts, and the mounting holes are located on the protrusions at positions corresponding to the threaded holes of the fixed connection parts.

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